Neoaureothin is an unusual chain-extended analogue of aureothin. It was first reported as a co-metabolite of neoantimycin in Streptomyces orinoci. It has been reported to have anti-HIV and antifungal activity. In-house bioassays have shown this metabolite to possess potent nematocidal and antitumor activity, with limited antifungal activity. Recent investigations have identified two photo-isomers of neoaureothin, Antibiotics SNF4435C and D, as potent immunosuppressive agents. CAS Number: 28900-27-8 Molecular Formula: C28H31NO6 Molecular Weight: 477.6 Source: from Streptomyces sp. Purity: > 99% by HPLC